Sorry can't comment on the salt water -- land locked lakes here in Alberta although I hear there is a salt water lake in Saskatchewan I should go play on.
That boat has seen some travelling by the sounds of it.
I know from trailering I had some issues with the wake tower on my boat -- if you have a tower look it over for stress cracks although I think they had changed the design by your model year (mine's the 2003 first year 4tec sportster).
Take it for a test drive like Dr. Honda suggests - for all intense purposes drive it like you will own it shortly. It should get up on plane quick (few seconds) and there shouldn't be any cavitation once cruising; neutral should be just that neutral (mine still thinks it needs to go forward and haven't got to adjusting). Speedo top end on a relatively calm lake should get you 50+ with a light load onboard -- less than that (and you probably want to do this anyway) take a flashlight see if you can get a look on the wear ring and impeller -- looking for ring gouges, and impeller dings, etc.
I found one issue by shutting the boat down on the lake and trying to restart, and it didn't start without some manual electrical intervention -- got seller to drop price although cleaning up all main electrical connections seemed to fix the issue
. Make sure to check all the electrical items -- after i got mine I found things that didn't work due to blown fuses and some that did work only because of over-amp fuses. Live and learn.
I am sure others will chime in regarding other mechanical engine checks -- compression, etc.
Hope all goes well and you join the Seadoo family.
Enjoy,
shamski
